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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eaca1f35b8a9913de455a49cf62fcf0eeaf0200692bfeb9901df91f4ddbf0a2' 
  AND token = 'd8U4UPIocfMGubD7xRZuDX+J6A6eClsuutSxZVSuZYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}